CGFloat addition bug?

Question

I was trying to add some CGFloat values recursively in my program. And I just realized in one particular scenario the total generated was incorrect. To ensure I had nothing

Answer 1

CGFloat is a single precision float on 32 bit targets such as iOS - it only has a 23 bit mantissa, i.e. around 6 - 7 significant digits. Use a double precision type if you need greater accuracy.

You should probably read David Goldberg's What Every Computer Scientist Should Know About Floating-Point Arithmetic before proceeding much further with learning to program.